Get progress bar rendering working

tools/tui/progress-bar_test.go

@@ -0,0 +1,25 @@
+// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package tui
+
+import (
+	"fmt"
+	"kitty/tools/wcswidth"
+	"testing"
+)
+
+var _ = fmt.Print
+
+func TestRenderProgressBar(t *testing.T) {
+
+	test := func(frac float64, width int) {
+		b := RenderProgressBar(frac, width)
+		a := wcswidth.Stringwidth(b)
+		if a != width {
+			t.Fatalf("Actual length %d != Expected length %d with fraction: %v\n%s", a, width, frac, b)
+		}
+	}
+	test(0.9376609994848016, 47)
+	test(0.9459041731066461, 47)
+	test(0.9500257599175682, 47)
+}